Furnace



I Feb. 26 1924, 1,484,908

T. SHERWOOD FURNACE Filed 0611. 1, 1923 '2 Sheets-Sheet 1 Feb, 26, 1924 I 1,4849% T. c. SHERWOOD v FURNACE Filed 1923 2 Sheets-Sheet 2 TGElfWdap 535 is preferably $5 shell 8 spaced" from 50 let stack 12.

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TRUMAN G. SHERWOOD, F DAIWILLE, ILLDIOIS, ASSIG-NOR 0F EGETY-IIHQ'E GHE- HUNDBETHS T0 EUBERT R. VAN NQRDSTEAND, 0 F DAEWILLE, IIJIJH'IGIS- FUEE'ACE.

Application E State of Illinois, have invented certain new and useful Improvements in Furnaces,=oi

which the following is a specification.

This invention relates to furnaces, and more particularly to pipeless furnaces.

An object of the invention is the provision of a furnace of this character having an improved air feed. whereby substantially complete combustion 'is obtained, with resulting economg in e f A further 0 ject is to provide a furnace in which fresh air drawn from the outside is heated and delivered to the building and .air withdrawn from the building is superheated and employed in the fire box to support combustion.

In the accompanying drawings, l hagi shown one embodiment'of the invention. this showing:

' Figure 1 is a front elevation,

Figure 2 is a central vertical sectional view,

Figure 3 is a horizontal sectional view on line 3-3 of Figure 2,

Figure 4*- is a similar view on line fr-4 of W Figure 2, and,

Figure 5 is a similar view on line 5+5 oi Figure 2.

Referring to the drawings, the reference y h sage 19 under the grate, and

numeral 1 designates an outer casing whic cylindrical and which extends from the floor 2 of the cellar to the first floor 3 of the building to be'heated. The casing is rovide with a fresh air chamber a at the ottom, which is connected to the outside of the building by means of a pipe 5. The chamber is provided with, an outlet 6 communicating with an air heating space or passage 7. As shown the air heating space or passage is formed by an inner cylindrical the outer shell and a furnace cylinder 9. Within the furnace cylinder, there is provided the usual grate 10, the cylinder a ove the grate forming a fire box 11 which is provided with the usual out- 'lhe top of the shell or casin 1 is providedwith a grating orregister 13 arranged in the floor 3, and air 'fi'om the room is withdrawn through space 14 between the outer shell 1 and the inner shell 8. The bottom of the inner shell is flared, as at 15,

and a wall 17 extends upwardly from this parent from the an Octcber 1, 192a Serial to. assert.

forming a restricted passage through which this withdrawn air passes. The lower air chamber is provided with a top plate 16, extending across the furnace beneath the grate plate, substantially parallel to the flared portion of the bottom of the shell 8. ihis forms an air passage 18 for thewithdrawn air, part of which passes through a passage 19 under the grate. lhe remaining portion of the withdrawn air passes through a passage 20obetween the furnace cylinder and a shell or eylinder'21 surrounding the grate. This air is superheated and passes through openlugs 22 into the fire box combining with the gases formed from the combustion of the fuel and producing'substantially perfect combustron. The fresh air from the passage 7 is heated by conduction and radiation and passes outwardly through the central portion of the register 13 into the room to be heated.

Ehe operation of the device will be apforegoing description. lfhe continual 'supply of fresh air from the exterior afiords pure air for heating at all times and thus serves as a'ventilating device as wellas a heating apparatus. air is heated during its travel through the passage or chamber '2 and thoroughly heats the room in which it is admitted. The withdrawn air passing through the passage 14; supplies the oxygen for the initial combustion of the fuel b means of the air passing through the pasthen supplies additional preheated air to the fire box 11 to through the openings 22 to completely consome the gases, such as carbonmonoxide in the products of combustion from the grate. By extending the passages 19 and 20 entirely around the furnace, an even distribution of air is obtained and thus even burning of the fuel in the fire box is obtained.

It is to be understood that the form of my invention herewith shown and describe is to be taken as a preferred example of the same, and that various changes in the shape,

from to form a heating chamber, means for feeding air from said air chamber to said heating chamber, and means for returning air from the room heated to the fire box of the furnace.

In a pipeless furnace, an inner casing and an outer casing forming a return passage, a furnace cylinder arranged within said inner casing and spaced therefrom to form a heating chamber, a passage connectin said return passage to the ash pit of the furnace, means for delivering air from said last passage to the fire box and preheating 1t, and means for delivering fresh air to said heating chamber.

3. In a pipeless furnace, an inner casing and an outer casing forming a return passage, a furnace cylinder arranged Within said inner casing and spaced therefrom to form a heating chamber, a passage connecting said return passage to the ash pit of the furnace, a passage within said furnace chamber connected to said last mentioned passage furnace,

emos extending around the grate of the furnace to the fire box to preheat air and deliver it to the fire box, and means for delivering fresh air to said heating chamber.

4:. In a pipeless furnace, an inner casing and an outer casing, forming a return passage, a furnace cylinder arranged within said inner casing and spaced therefrom to form a heating chamber, a passage connecting said return passage to the ash pit of the means for delivering air from said last passage to the fire box and preheating it, an air chamber arranged beneath said furnace and connected to said heating chamber, and an air pipe connecting said air chamber to the exterior of the building to be heated. V In testimony whereof, I affix my signa ture in presence of two witnesses.

TRUMAN c. sHEnWoon. 

